15dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org/* 25dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 35dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * 45dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * Use of this source code is governed by a BSD-style license 55dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * that can be found in the LICENSE file in the root of the source 65dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * tree. An additional intellectual property rights grant can be found 75dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * in the file PATENTS. All contributing project authors may 85dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org * be found in the AUTHORS file in the root of the source tree. 95dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org */ 105dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 115dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org// Modified from the Chromium original: 125dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org// src/media/base/sinc_resampler.cc 135dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 145dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org#include "webrtc/common_audio/resampler/sinc_resampler.h" 155dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 165dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org#include <arm_neon.h> 175dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 185dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.orgnamespace webrtc { 195dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 205dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.orgfloat SincResampler::Convolve_NEON(const float* input_ptr, const float* k1, 215dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org const float* k2, 225dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org double kernel_interpolation_factor) { 235dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org float32x4_t m_input; 245dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org float32x4_t m_sums1 = vmovq_n_f32(0); 255dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org float32x4_t m_sums2 = vmovq_n_f32(0); 265dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 275dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org const float* upper = input_ptr + kKernelSize; 285dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org for (; input_ptr < upper; ) { 295dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org m_input = vld1q_f32(input_ptr); 305dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org input_ptr += 4; 315dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org m_sums1 = vmlaq_f32(m_sums1, m_input, vld1q_f32(k1)); 325dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org k1 += 4; 335dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org m_sums2 = vmlaq_f32(m_sums2, m_input, vld1q_f32(k2)); 345dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org k2 += 4; 355dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org } 365dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 375dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org // Linearly interpolate the two "convolutions". 385dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org m_sums1 = vmlaq_f32( 395dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org vmulq_f32(m_sums1, vmovq_n_f32(1.0 - kernel_interpolation_factor)), 405dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org m_sums2, vmovq_n_f32(kernel_interpolation_factor)); 415dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 425dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org // Sum components together. 435dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org float32x2_t m_half = vadd_f32(vget_high_f32(m_sums1), vget_low_f32(m_sums1)); 445dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org return vget_lane_f32(vpadd_f32(m_half, m_half), 0); 455dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org} 465dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org 475dea86a9c0ad69135561667a6912b26be0de692bandrew@webrtc.org} // namespace webrtc 48